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This article mainly introduces "what is JUnit testing". In daily operation, I believe many people have doubts about what is JUnit testing. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what is JUnit testing"! Next, please follow the editor to study!

1. What is the JUnit test?

JUnit is a unit testing framework for the Java language. Founded by Kent Beck and Erich Gamma, it has gradually become the most successful xUnit family derived from sUnit in Kent Beck. JUnit has its own JUnit extended biosphere. Most Java development environments have integrated JUnit as a unit testing tool.

JUnit is a regression testing framework written by Erich Gamma and Kent Beck. JUnit testing is programmer testing, which is called white-box testing, because programmers know how and what functions the software being tested performs. JUnit is a framework that inherits the TestCase class and can be tested automatically with JUnit.

JUnit testing is similar to debugging in the c language, except that debugging is done by setting breakpoints to separate code, while JUnit in java is achieved by testing different classes and methods separately.

2. JUnit running environment

JUnit can be tested quickly through ide. I use eclipse here, and you can test by adding new-other-java-JUnit to the class that needs to be tested. JUnit4 is used for debugging here, and the latest version of JUnit is JUnit5. The most significant difference between the two versions is in the supported version: java4 supports java5 and above, while java5 only supports java8 and above.

3. JUnit naming convention

JUnit tests have several potential naming conventions. A broad solution is to add the suffix "Test" to the end of the name of the test class.

As a general rule, the name of each test method should clearly indicate the current test task. If the test method is completed correctly, it avoids looking at the implementation logic in the actual code.

Another convention is to use "should" in the name of the test method. For example, "ordersShouldBeCreated" or "menuShouldGetActive". This will remind us of what this test method has done. Another method is to use "Given [ExplainYourInput] When [WhatIsDone] Then [ExpectedResult]" as the name of the test method.

4. Test execution sequence

JUnit assumes that all test methods can be executed in any order. High-quality test code should not assume any order, that is, one piece of test code cannot rely on other test code.

In JUnit4.11, tests are performed in a deterministic but unpredictable order by default (As of JUnit4.11 the default is to use a deterministic, but not predictable, order for the execution of the tests.)

Of course, you can use annotations to define the names of test methods sorted in dictionary order. If you want to enable this feature, you need to use the @ FixMethodOrder (MethodSorters.NAME_ASCENDING) annotation to mark the test class, or you can explicitly use the default value by setting the MethodSorters.DEFAULT parameter. You can also use MethodSorters.JVM to make it clear that it uses the default value of JVM.

At this point, the study on "what is a JUnit test" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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